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INVERTEBRATES: Theodoxus fluviatilis


caridina English Edition - epaper ⋅ Ausgabe 3/2019 vom 30.07.2019

Though on the Red List, the river nerite can reproduce in captivity.

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A beautiful river nerite on hard substrate.


These beautiful small snails are native in Europe, where they inhabit smaller and larger rivers, and can also be found in the surf zone of big lakes. In aquaria, they seem to prefer hard substrates, but from time to time they will also crawl across sandy areas while ...

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... searching for food. They’ll eat all kinds of natural food and the biofilm forming on all surfaces in the aquarium. The river nerite may reach an age of two to three years, and is dioecious, i.e.there are males and females. These nice little snails do very well in unheated tanks.

After mating, the females lay their egg capsules on hard substrates or on the shells of other snails. After approximately 30 days, at a water temperature of 19 °C (66.2 °F), one to three young snails will hatch from one capsule. It contains a lot more eggs, which serve as food for the young snails inside the capsule, though.

Fact sheet

Trivial name:
River nerite

Scientific name:
Theodoxus fluviatilis

Origins: temperate and warm temperate zones in Europe

Size: approx. 10 mm long

Water: medium to hard

Water temperature: 0-28 °C (32-82.4 °F), depending on the season

Food: detritus, diatoms, pumpkin chips, powdered food, dried walnut leaves

Tank-bred river nerites are highly compatible with aquarium-keeping


River nerites mating.


A river nerite adorned with egg capsules, and “stowaway”.


Egg capsules ofTheodoxusfluviatilis .


WhileTheodoxus fluviatilis may rid the aquarium of small green hard algae, they still need to be fed in addition. The aquarium temperatures should mimic the seasonal fluctuations in nature.

The river nerite can be kept in tanks with dwarf shrimp, other gastropods and peaceful fish. Please do not co-house them with crayfish and carnivores or molluscivores.

T. fluviatilis may not be taken from nature, as it is on the Red List. There are some aquarium hobbyists that breed them in captivity, though. Please keep in mind: Only the purchase of tank-bred snails is legal.

Conclusion: The river nerite is a small, interesting snails with a beautiful shell that reproduces in the aquarium.

LITERATURE:

Peter Glöer & Claus Meier-Brook (2004): Süßwassermolusken. 13. Auflage, 135 S., Deutscher Jugendbund für Naturbeobachtungen, Göttingen.
Peter Glöer (2002): Mollusca I. Die Süßwassergastropoden Nordund Mitteleuropas. 2. Auflage, 327 S., Hackenheim (ConchBooks); in der Reihe: Dahl: Die Tierwelt Deutschlands.